<template>
  <view>
    <my-search @goSearch="searchHandler"></my-search>
    <view class="scroll-view-container">
      <scroll-view scroll-y="true" class="left-scroll-view" :style="{height:height + 'px'}">
        <block v-for="(item,index) in cateList" :key="index">
          <view :class="['left-scroll-view-item',index == active ? 'active' : '']" @click="updateActive(index)">{{item.cat_name}}</view>
        </block>
      </scroll-view>
      <scroll-view scroll-y="true" class="right-scroll-view" :style="{height:height + 'px'}" :scroll-top="scrollTop">
        <view class="cate-lv2" v-for="(item2,index) in cateLevel2" :key="index">
          <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
          <view class="cate-lv3-list" >
            <view class="cate-lv3-item" v-for="item3 in item2.children" :key="item3.cat_id" @click="goToDetails(item3)">
              <image :src="item3.cat_icon.replace('dev','web')"></image>
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  import badgeMixin from '@/mixins/tabbar-badge.js'
  export default {
    mixins : [badgeMixin],
    data() {
      return {
        height : 0,
        cateList: [],
        active : 0,
        cateLevel2 : [],
        scrollTop : 0
      };
    },
    onLoad() {
      let sysInfo = uni.getSystemInfoSync()
      this.height = sysInfo.windowHeight - 50
      this.getCateList()
    },
    methods : {
      searchHandler() {
          uni.navigateTo({
            url: '/subpkg/search/search'
          })
      },
      async getCateList() {
        let {data} = await uni.$http.get('/api/public/v1/categories')
        if(data.meta.status !== 200) return uni.$showMsg()
        this.cateList = data.message
        this.cateLevel2 = data.message[this.active].children
      },
      updateActive(index) {
        this.active = index
        this.cateLevel2 = this.cateList[index].children
        this.scrollTop = this.scrollTop == 0 ? 1 : 0
      },
      goToDetails(item) {
        uni.navigateTo({
          url:'/subpkg/goods_detail/goods_detail?cid='+item.cat_id+'' 
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;

  .left-scroll-view {
    width: 120px;

    .left-scroll-view-item {
      line-height: 60px;
      background-color: #f7f7f7;
      text-align: center;
      font-size: 12px;

      // 激活项的样式
      &.active {
        background-color: #ffffff;
        position: relative;

        // 渲染激活项左侧的红色指示边线
        &::before {
          content: ' ';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          position: absolute;
          left: 0;
          top: 50%;
          transform: translateY(-50%);
        }
      }
    }
  }
}
.right-scroll-view {
  background-color: white;
  .cate-lv2-title {
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    padding: 15px 0;
  }
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
  
    .cate-lv3-item {
      width: 33.33%;
      margin-bottom: 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
  
      image {
        width: 60px;
        height: 60px;
      }
  
      text {
        font-size: 12px;
      }
    }
  }
}

</style>
